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23. Which of the following represent measures of variability (or dispersion)? a. variance and mean b....

23. Which of the following represent measures of variability (or dispersion)?

a. variance and mean

b. standard deviation and range

c. standard deviation and mean

d. median and mode

10. If a marketing manager is considering segmenting the market by age, which of the following differences between age groups in product usage rates would provide reliable evidence?

a. a positive difference

b. a mathematically significant difference

c. a large difference

d. a statistically significant difference

20. The regression coefficient b, the slope, represents:

a. The intercept for the regression model

b. The average change in Y corresponding to a unit change in the independent variable X

c. The probability that a large change in the dependent variable Y is statistically significant

d. An estimate of the standard deviation for the dependent variable Y

Math   Statistics-And-Probability   
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